Primer for shells



Patentl Feb. 24, l920- Uurrsn s'rA'rEs PATENT' voinncn.V

CARL G. HEIBY, 'I'OHN BHURKAM, DAVID E. LINDQUIST, FRED L. RIGGIN, EBENEZEB W.

ALLEN, AND RICHARD LAU, Fv SARNIA, CANADA, ASSIGNOBS, BY MESNE ASSIGN- MENTS, TO MUELLEB. METALS COMPANY, 0F PORT HUBON, MICHIGAN, A ,CORPORA- TION 0F' MICHIGAN.

PRIMER Fon. sHELrs.

ToaZZ whom t may concern:

Be it known that we, CARL G. Hmmm-- JOHN BURKAM, DAVID E. LrNDQUIsT, FRED- L. RIGGIN, EBENEZER W. ALLEN, and RIGH- ARD LAU, all citizens of the United States, except ALLEN, a subject of Great Britain, residing at Sarnia, in the county of Lambton and Dominion of Canada, have invented new and useful Improvements in Primers for Shells, of which the following 1s a' speclcatlon. y

The present invention relates to primers for shells, and has for its object toproduce a forging suitable for such primers from a blank or slug, which forging, after its has passed through the die press, and has been trimmed, will be of such form that the work of finishing the primer -by` machining,

threading and boring will be reduced to a.

minimum, the forging as vit comes from the press being substantially in final form with merel 'suflicient metal to allow for the nishing operations, there being practically no surplus metal to be cut away aside from such metal as is removed during machining, threadingV and boring the several sections of the prlmr which have to beso treated.

In order that the invention may be understood by those skilled in the art, we have shown herein a primer for shells constructed'in accordance with the invention, and in vthe drawingsv Figure 1 is a view in side elevation of a blank or slug from which the primer is made.

Fig. 2 is a view inv section of the slug after it has been forged and prior to trimmm Fig. 3 is a view in section of the forging lafter trimming.

primer.

Referring to the drawings by numbers, like numbers indicating like parts in the several views, the slug- 10, shown in the present instance as cylindrical, may be formed in any suitable manner, as by casting as an individual slug, by casting ina long bar from which the slugs may be cut, or by cutting the slugs Afrom a rolledfor vdrawn bar, the manner of forming the slug being immaterial for the purposes of the present invention.- The slug shown in- Fig. 1 is indicated as 'an individually cast slug, and where these Fig. 4 is a view in section of the nished slugs are cast individually there is ord' narily a top or crown 11 which .contains vmore or less dross or floating impurities' whichl rise to the top of the molten metal, and form an incrustatinn'of impure'matter. This will irst be machined off down to the dotted line 12, leaving a section of pure metal to be subjected to the action of the Specification of Letters Patent. Patented Feb, 24, :I Qf)l l l f Application iledJ'anuary 17, 1918,. Serial No. 212,232.

press, The machined slug will have formed therein, generally," although not necessarily, 1n the center Aof one of its ends, a depression or cavity 13 which is designed to engage a complementary part on a die memberso as to centerl the slug accurately between the dies, these dies not being shown inconnection with the present development, as they may be of any desired or necessary form, dependent, of course, on the article to be produced. I 4

The blank lafter it has been `subjected t0 the action of the dies is in the form shown.

in Fig, 2,'having the annular upstanding top 14. centralll of'which is a projecting part 15, and be ow said annular top'14 are the stepped cylindrical sections 16 and 17, At the base of the bottom section 17 is a laterally projecting annular iin or flash 18, where the Slight excess of metal is squeezed out by the dles, and this annular flash 18 w11] af-f" terward be trimmed off, bringing the .forg-, ing to the condition shown in Fig. 3, where it isready for finishing.

Thel finished primer is shown in Fig. 4, and it will be observed that the annular top .19 is of substantially the forged form shown at 14 in Fig. 3, there having been provided merely sufficient metal to permit of a good vfinishing by machining, but without compelling the removal of any great quantity of metal by the relatively slow and costly method of machining. The same is true with respect to the threaded section 20, which is formed upon the forged section 16,' which forged section provides merely a sufficient amount of metal to permit a proper threading operation. The base portlon 17 of the forging is machined away, as shownat Fig. 4, to a slightextent to give the 'an-f nular rim or rabbet 21. It will be apparent 'Y that the finished primer shown in Fig. 4 is eXteriorly of substantially the form of the forging of Fig. 3, except with respect to the finishing operations, there being comparatively no loss ofrmetal or expenditure of? time and labor by the machining operations',

vwhich are resorted to merely to give the 22 of the shell is merely finished' so `far as its annular Wall is concerned, and slightly deepened as shown in Fig. 4, so-as 'to give greater projection to the central boss of the forging. The central boss and the body of the primer are then bored to form the central chamber 23, a portion 2l of which is threaded as shown.

By this method an article of this character may be expeditiously formed, and at comparatively slight cost, owing to the fact that the costly steps of machining to bring the blank or slug to its finished form are practically eliminated.

We claim v 1. A forging for shell primers having a body portion with an annular cavity forgedv in one end thereof, centrally of which is forged a projection.

2. A forging for shell primers having a. body portion, the exterior surface of which is stepped. to form projections for machiningv and threading, and in one end of which set our hands.

stepped surface of larger diameter adjacent said annular rim to provide a threading element, and a base portion of enlarged diameter to provide the material for rabbeting.

4. A forging for shell primers having a .body portion, the external surface of which is stepped to form kprojections for machinling and threading, and in one end of which is forged a cavity.

5. A forging for shell primers comprising a body portion having an annular upstanding rim, a steppedsurface of larger diameter adjacent said annular rim to provide a. threading element and a. base portion ofenlarged diameter to provide the material for rabbeting.

In testimony whereof We lhave hereunto CARL G. HEIBY. JOHN BURKAM. DAvID E. LINDQUIST. FRED L. RIGGIN. EBENEZER W. ALLEN.`

RICHARD LAU. l 

